The preparation method of high purity 2,6-diaminotoluene

The invention discloses high purity 2, the preparation method of 6-diaminotoluene, comprise the following steps: use containing 10% ~ 20%2, the mixing dinitrotoluene (DNT) of 4-dinitrotoluene (DNT) is raw material, by hydrogenation reaction under palladium-carbon catalyst effect, the obtained mixing diaminotoluene aqueous solution, cooling, crystallization, blowing suction filtration, centrifuge dehydration, vacuum-drying obtain high purity 2,6-diaminotoluene.High purity 2 of the present invention, the preparation method of 6-diaminotoluene, require low to material purity, adopt containing 2, the mixing dinitrotoluene (DNT) of 4-dinitrotoluene (DNT) 10% ~ 20%, by hydrogenation (palladium-carbon catalyst) reaction, uses water as solvent, under the specified conditions that preparation method of the present invention chooses, prepare yield more than 50%, purity higher than more than 99.5% 2,6-diaminotoluene products; It is simple to operate, and production cost is low, not only environmental protection but also economic, is beneficial to large-scale industrial production.